What: /sys/class/mei/
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Date: May 2014
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KernelVersion: 3.17
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Contact: Tomas Winkler <tomas.winkler@intel.com>
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Description:
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The mei/ class sub-directory belongs to mei device class
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What: /sys/class/mei/meiN/
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Date: May 2014
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KernelVersion: 3.17
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Contact: Tomas Winkler <tomas.winkler@intel.com>
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Description:
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The /sys/class/mei/meiN directory is created for
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each probed mei device
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What: /sys/class/mei/meiN/fw_status
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Date: Nov 2014
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KernelVersion: 3.19
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Contact: Tomas Winkler <tomas.winkler@intel.com>
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Description: Display fw status registers content
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The ME FW writes its status information into fw status
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registers for BIOS and OS to monitor fw health.
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The register contains running state, power management
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state, error codes, and others. The way the registers
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are decoded depends on PCH or SoC generation.
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Also number of registers varies between 1 and 6
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depending on generation.
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What: /sys/class/mei/meiN/hbm_ver
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Date: Aug 2016
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KernelVersion: 4.9
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Contact: Tomas Winkler <tomas.winkler@intel.com>
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Description: Display the negotiated HBM protocol version.
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The HBM protocol version negotiated
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between the driver and the device.
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What: /sys/class/mei/meiN/hbm_ver_drv
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Date: Aug 2016
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KernelVersion: 4.9
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Contact: Tomas Winkler <tomas.winkler@intel.com>
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Description: Display the driver HBM protocol version.
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The HBM protocol version supported by the driver.
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What: /sys/class/mei/meiN/tx_queue_limit
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Date: Jan 2018
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KernelVersion: 4.16
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Contact: Tomas Winkler <tomas.winkler@intel.com>
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Description: Configure tx queue limit
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Set maximal number of pending writes
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per opened session.
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What: /sys/class/mei/meiN/fw_ver
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Date: May 2018
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KernelVersion: 4.18
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Contact: Tomas Winkler <tomas.winkler@intel.com>
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Description: Display the ME firmware version.
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The version of the platform ME firmware is in format:
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<platform>:<major>.<minor>.<milestone>.<build_no>.
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There can be up to three such blocks for different
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FW components.
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What: /sys/class/mei/meiN/dev_state
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Date: Mar 2019
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KernelVersion: 5.1
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Contact: Tomas Winkler <tomas.winkler@intel.com>
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Description: Display the ME device state.
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The device state can have following values:
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INITIALIZING
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INIT_CLIENTS
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ENABLED
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RESETTING
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DISABLED
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POWER_DOWN
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POWER_UP
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What: /sys/class/mei/meiN/trc
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Date: Nov 2019
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KernelVersion: 5.5
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Contact: Tomas Winkler <tomas.winkler@intel.com>
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Description: Display trc status register content
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The ME FW writes Glitch Detection HW (TRC)
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status information into trc status register
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for BIOS and OS to monitor fw health.
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What: /sys/class/mei/meiN/kind
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Date: Jul 2020
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KernelVersion: 5.8
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Contact: Tomas Winkler <tomas.winkler@intel.com>
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Description: Display kind of the device
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Generic devices are marked as "mei"
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while special purpose have their own
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names.
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Available options:
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- mei: generic mei device.
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- itouch: itouch (ipts) mei device.
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